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Leak from velocity adjust hole

Let me start by saying that the problem here is about one hundred percent likely to be my fault. I've been getting my pneumatic trigger finished for my tac one. However, Saturday I took all the unfinished trigger pneumatics off the marker and re-installed the original equipment.
The marker now leaks down the velocity adjust hole.
The first shot velocity is usually radically high
After a shot or two the leak stops for a moment, but returns after a few seconds
Shots taken after the first in a series can be relatively consistent
If I wait a moment and shoot after the leak returns, the velocity will be very high again

I think I'll have half an hour Friday to look at this after the broodlings are in bed, any suggestions for places to start looking would be great

Ok. Type of valve? Level 10 or 7 bolt? If it's a Classic valve that you added an L10 to, it may possible have the older reg piston which cannot handle the pressures needed for the L10 to operate properly. If this is the case, you will need to contact AGD or Tuna and buy a new reg piston.